#StackBounty: #mysql #mariadb Why are the system tables in MySQL and MariaDB utf8 and not utf8mb4?

Bounty: 200

I know the general advice is never to use utf8, but instead to use utf8mb4. If that’s the advice, then why do the system tables themselves use utf8?

You can see this in the MariaDB test suite, and and the MySQL test suite; or, by using SHOW CREATE TABLE mysql.db;

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